64399143 has 4 divisors (see below), whose sum is σ = 85865528. Its totient is φ = 42932760.

The previous prime is 64399087. The next prime is 64399147. The reversal of 64399143 is 34199346.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-64399143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64399147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10733188 + ... + 10733193.

It is an arithmetic number, because the mean of its divisors is an integer number (21466382).

Almost surely, 2^64399143 is an apocalyptic number.

64399143 is a deficient number, since it is larger than the sum of its proper divisors (21466385).

64399143 is a wasteful number, since it uses less digits than its factorization.

64399143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21466384.

The product of its digits is 69984, while the sum is 39.

The square root of 64399143 is about 8024.9076630202. The cubic root of 64399143 is about 400.8298252015.

The spelling of 64399143 in words is "sixty-four million, three hundred ninety-nine thousand, one hundred forty-three".